微胶囊型自修复环氧树脂材料的力学性能及修复效率OA北大核心CSTPCD

To investigate the effect of the introduction of self-healing epoxy microcapsules on the mechanical properties and repairability of resin-based composite materials,a repair system consisting of in-situ polymerized epoxy microcap-sules and phthalic anhydride as a latent curing agent was incorporated into the mixture of E51-type epoxy resin and modi-fied polyetheramine curing agent,resulting in the formation of self-healing epoxy resin-based composite materials.The shear viscosity of the mixing system was analyzed,and the mechanical and repairing performance of the composite materi-als were investigated.The results indicated that the increase of the content of self-healing components resulted in a de-crease in the mechanical properties of the composite materials but an increase in their healing efficiency.However,the tensile strength of the repaired composite materials did not show a linear increment.Through comprehensive analysis on the experimental results,the optimal choice was determined to be a self-healing component ratio of 3/2 and a microcap-sule content of 8 wt%for the composite materials.Under these conditions,the resultant composite material exhibited tensile strength of 15.32 MPa and post-repair tensile strength of 10.13 MPa,presenting a healing efficiency of 66.12%.